Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 803:
1938, 5th Philatelic Exhibition in Warsaw, imperforate and perforate souvenir sheets of four used on two Exhibition covers, fresh and VF, C.v. $270 for used sheets only, Fischer Block 5A, B, C.v. PLN700, Scott #B29-29C
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